Class ZipFile

  • All Implemented Interfaces:
    java.io.Closeable, java.lang.AutoCloseable

    public class ZipFile
    extends java.lang.Object
    implements java.io.Closeable
    Replacement for java.util.ZipFile.

    This class adds support for file name encodings other than UTF-8 (which is required to work on ZIP files created by native zip tools and is able to skip a preamble like the one found in self extracting archives. Furthermore it returns instances of org.apache.tools.zip.ZipEntry instead of java.util.zip.ZipEntry.

    It doesn't extend java.util.zip.ZipFile as it would have to reimplement all methods anyway. Like java.util.ZipFile, it uses RandomAccessFile under the covers and supports compressed and uncompressed entries. As of Apache Ant 1.9.0 it also transparently supports Zip64 extensions and thus individual entries and archives larger than 4 GB or with more than 65536 entries.

    The method signatures mimic the ones of java.util.zip.ZipFile, with a couple of exceptions:

    • There is no getName method.
    • entries has been renamed to getEntries.
    • getEntries and getEntry return org.apache.tools.zip.ZipEntry instances.
    • close is allowed to throw IOException.
    • Constructor Summary

      Constructors 
      Constructor Description
      ZipFile​(java.io.File f)
      Opens the given file for reading, assuming the platform's native encoding for file names.
      ZipFile​(java.io.File f, java.lang.String encoding)
      Opens the given file for reading, assuming the specified encoding for file names and scanning for unicode extra fields.
      ZipFile​(java.io.File f, java.lang.String encoding, boolean useUnicodeExtraFields)
      Opens the given file for reading, assuming the specified encoding for file names.
      ZipFile​(java.lang.String name)
      Opens the given file for reading, assuming the platform's native encoding for file names.
      ZipFile​(java.lang.String name, java.lang.String encoding)
      Opens the given file for reading, assuming the specified encoding for file names, scanning unicode extra fields.
    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      boolean canReadEntryData​(ZipEntry ze)
      Whether this class is able to read the given entry.
      void close()
      Closes the archive.
      static void closeQuietly​(ZipFile zipfile)
      close a zipfile quietly; throw no io fault, do nothing on a null parameter
      protected void finalize()
      Ensures that the close method of this zipfile is called when there are no more references to it.
      java.lang.String getEncoding()
      The encoding to use for filenames and the file comment.
      java.util.Enumeration<ZipEntry> getEntries()
      Returns all entries.
      java.lang.Iterable<ZipEntry> getEntries​(java.lang.String name)
      Returns all named entries in the same order they appear within the archive's central directory.
      java.util.Enumeration<ZipEntry> getEntriesInPhysicalOrder()
      Returns all entries in physical order.
      java.lang.Iterable<ZipEntry> getEntriesInPhysicalOrder​(java.lang.String name)
      Returns all named entries in the same order their contents appear within the archive.
      ZipEntry getEntry​(java.lang.String name)
      Returns a named entry - or null if no entry by that name exists.
      java.io.InputStream getInputStream​(ZipEntry ze)
      Returns an InputStream for reading the contents of the given entry.
      java.lang.String getName()  
      • Methods inherited from class java.lang.Object

        clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Constructor Detail

      • ZipFile

        public ZipFile​(java.io.File f)
                throws java.io.IOException
        Opens the given file for reading, assuming the platform's native encoding for file names.
        Parameters:
        f - the archive.
        Throws:
        java.io.IOException - if an error occurs while reading the file.
      • ZipFile

        public ZipFile​(java.lang.String name)
                throws java.io.IOException
        Opens the given file for reading, assuming the platform's native encoding for file names.
        Parameters:
        name - name of the archive.
        Throws:
        java.io.IOException - if an error occurs while reading the file.
      • ZipFile

        public ZipFile​(java.lang.String name,
                       java.lang.String encoding)
                throws java.io.IOException
        Opens the given file for reading, assuming the specified encoding for file names, scanning unicode extra fields.
        Parameters:
        name - name of the archive.
        encoding - the encoding to use for file names, use null for the platform's default encoding
        Throws:
        java.io.IOException - if an error occurs while reading the file.
      • ZipFile

        public ZipFile​(java.io.File f,
                       java.lang.String encoding)
                throws java.io.IOException
        Opens the given file for reading, assuming the specified encoding for file names and scanning for unicode extra fields.
        Parameters:
        f - the archive.
        encoding - the encoding to use for file names, use null for the platform's default encoding
        Throws:
        java.io.IOException - if an error occurs while reading the file.
      • ZipFile

        public ZipFile​(java.io.File f,
                       java.lang.String encoding,
                       boolean useUnicodeExtraFields)
                throws java.io.IOException
        Opens the given file for reading, assuming the specified encoding for file names.
        Parameters:
        f - the archive.
        encoding - the encoding to use for file names, use null for the platform's default encoding
        useUnicodeExtraFields - whether to use InfoZIP Unicode Extra Fields (if present) to set the file names.
        Throws:
        java.io.IOException - if an error occurs while reading the file.
    • Method Detail

      • getEncoding

        public java.lang.String getEncoding()
        The encoding to use for filenames and the file comment.
        Returns:
        null if using the platform's default character encoding.
      • close

        public void close()
                   throws java.io.IOException
        Closes the archive.
        Specified by:
        close in interface java.lang.AutoCloseable
        Specified by:
        close in interface java.io.Closeable
        Throws:
        java.io.IOException - if an error occurs closing the archive.
      • closeQuietly

        public static void closeQuietly​(ZipFile zipfile)
        close a zipfile quietly; throw no io fault, do nothing on a null parameter
        Parameters:
        zipfile - file to close, can be null
      • getEntries

        public java.util.Enumeration<ZipEntry> getEntries()
        Returns all entries.

        Entries will be returned in the same order they appear within the archive's central directory.

        Returns:
        all entries as ZipEntry instances
      • getEntriesInPhysicalOrder

        public java.util.Enumeration<ZipEntry> getEntriesInPhysicalOrder()
        Returns all entries in physical order.

        Entries will be returned in the same order their contents appear within the archive.

        Returns:
        all entries as ZipEntry instances
        Since:
        Ant 1.9.0
      • getEntry

        public ZipEntry getEntry​(java.lang.String name)
        Returns a named entry - or null if no entry by that name exists.

        If multiple entries with the same name exist the first entry in the archive's central directory by that name is returned.

        Parameters:
        name - name of the entry.
        Returns:
        the ZipEntry corresponding to the given name - or null if not present.
      • getEntries

        public java.lang.Iterable<ZipEntry> getEntries​(java.lang.String name)
        Returns all named entries in the same order they appear within the archive's central directory.
        Parameters:
        name - name of the entry.
        Returns:
        the Iterable<ZipEntry> corresponding to the given name
        Since:
        1.9.2
      • getEntriesInPhysicalOrder

        public java.lang.Iterable<ZipEntry> getEntriesInPhysicalOrder​(java.lang.String name)
        Returns all named entries in the same order their contents appear within the archive.
        Parameters:
        name - name of the entry.
        Returns:
        the Iterable<ZipEntry> corresponding to the given name
        Since:
        1.9.2
      • canReadEntryData

        public boolean canReadEntryData​(ZipEntry ze)
        Whether this class is able to read the given entry.

        May return false if it is set up to use encryption or a compression method that hasn't been implemented yet.

        Parameters:
        ze - ZipEntry
        Returns:
        boolean
      • getInputStream

        public java.io.InputStream getInputStream​(ZipEntry ze)
                                           throws java.io.IOException,
                                                  java.util.zip.ZipException
        Returns an InputStream for reading the contents of the given entry.
        Parameters:
        ze - the entry to get the stream for.
        Returns:
        a stream to read the entry from.
        Throws:
        java.io.IOException - if unable to create an input stream from the zipentry
        java.util.zip.ZipException - if the zipentry uses an unsupported feature
      • getName

        public java.lang.String getName()
      • finalize

        protected void finalize()
                         throws java.lang.Throwable
        Ensures that the close method of this zipfile is called when there are no more references to it.
        Overrides:
        finalize in class java.lang.Object
        Throws:
        java.lang.Throwable
        See Also:
        close()